Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-15 | 180/90-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.92 (633) | 27.76 (705) | 2.83 (72) 11.4% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 78.29 (1988.63) | 87.2 (2214.82) | 8.91 (226.19) 11.4% |
| Sidewall Height inches (mm) | 4.96 (126) | 6.38 (162) | 1.42 (36) 28.6% |
| Revolutions per mile (km) | 809.27 (502.86) | 726.62 (451.5) | -82.65 (-51.36) -10.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.27 mph (35.85 km/h) |
| 25 mph (40.23 km/h) | 27.84 mph (44.81 km/h) |
| 30 mph (48.28 km/h) | 33.41 mph (53.77 km/h) |
| 35 mph (56.33 km/h) | 38.98 mph (62.73 km/h) |
| 40 mph (64.37 km/h) | 44.55 mph (71.7 km/h) |
| 45 mph (72.42 km/h) | 50.12 mph (80.66 km/h) |
| 50 mph (80.47 km/h) | 55.69 mph (89.62 km/h) |
| 55 mph (88.51 km/h) | 61.26 mph (98.58 km/h) |
| 60 mph (96.56 km/h) | 66.82 mph (107.54 km/h) |
| 65 mph (104.61 km/h) | 72.39 mph (116.51 km/h) |
| 70 mph (112.65 km/h) | 77.96 mph (125.47 km/h) |
| 75 mph (120.7 km/h) | 83.53 mph (134.43 km/h) |
| 80 mph (128.75 km/h) | 89.1 mph (143.39 km/h) |
| 85 mph (136.79 km/h) | 94.67 mph (152.35 km/h) |
| 90 mph (144.84 km/h) | 100.24 mph (161.32 km/h) |
| 95 mph (152.89 km/h) | 105.81 mph (170.28 km/h) |
| 100 mph (160.93 km/h) | 111.37 mph (179.24 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1849 | 2148 | 2313 | 2416 | 2526 | 2605 | 2691 | 2793 | 2935 | 3077 | 3234 | 3360 | 3588 | 3840 | 4037 | 4162 | 4233 | 4493 | 4855 | 5642 |
Better Fuel Economy Factory Ratios Increased Power
